JPS5826645Y2 - Bone drilling bur - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bone drilling bur, and more particularly to a bur used for forming holes or grooves in bones during surgeries in dentistry, oral surgery, orthopedic surgery, and the like.

BACKGROUND ART Conventionally, in the field of surgery, it has become necessary to drill holes in bones, for example, for repairing fractures, and members such as drills and burs for forming bone holes have been put into practical use.

According to a well-known bone drilling bur, for example, as shown in FIG. A drive mechanism (not shown) connected to the rear end is actuated to drill into the bone 3.

However, if the bar is tilted due to hand tremors, etc. (see chain line in Figure 1), the drilling direction may be incorrect, or the hole edge may be ground, resulting in a very large hole diameter near the opening 3'. was there.

Therefore, it may be possible to shorten the cutting edge of the bar, but
The drawback that the drilling direction is inclined still remains.

Furthermore, since the depth of the hole was checked visually during drilling,
There were many cases where the holes were drilled too deep.

When implanting a dental implant, i.e., an artificial tooth root, etc., it is necessary to form a hole with a predetermined diameter and depth or a groove with a predetermined width and depth at a predetermined position in the bone. In some cases, it was fatal and was one of the major causes of dental implant failure.

The present invention was devised to eliminate such drawbacks, and it is possible to accurately and reliably form a hole with a predetermined diameter and depth at a predetermined position in the bone even if some grain formation occurs. I can,
Furthermore, the present invention provides a bone drilling bar that allows the depth of the hole to be easily confirmed.

Hereinafter, the present invention will be explained based on embodiments shown in the accompanying drawings.

As shown in FIGS. 2a and l), the bar designated as B as a whole has a blade portion 2 at the tip of a shaft portion 1, and a joint portion 4 with a drive mechanism (not shown) at the rear end. By the operation of the drive mechanism, the bar B rotates, and the blade portion 2 perforates the bone to a required depth.

Furthermore, in the bar B, the length of the blade portion 2 is shorter than the depth d of the hole to be formed (see FIG. 3),
At least one knob-shaped protrusion 5 having a diameter equal to or slightly smaller than the diameter l of the blade portion 2 is formed at an appropriate location on the shaft portion 1.

Note that the protrusion 5 is provided at a position separated from the tip of the blade 2 by an appropriate measurement distance, and is designed to serve as a guide for the depth of the hole during drilling.

Thus, for example, when a bone is drilled using the bar B shown in FIG. 2a, as shown in FIG.
Even if the bar B tries to incline due to grain formation, etc., the protrusion 5 comes into contact with the hole edge of the bone 3, so the inclination of the bar B is prevented. blocked,
Holes with a uniform diameter can be drilled in the depth direction of the hole.

Furthermore, since the depth of the hole can be accurately recognized just by looking at the position of the protrusion 5 while drilling, the hole can be reliably drilled to the desired depth.

The present invention is not limited to the embodiments described above, and various modifications can be made regarding the number, shape, etc. of the protrusions 5.

In particular, regarding the shape of the protruding portion 5, a plurality of convex portions may be formed on the circumferential surface of the shaft portion 1 instead of the illustrated large-diameter knob-like portion.

Further, the protrusion 5 may be formed integrally with the shaft portion 1, or the two may be formed separately and fixed to each other.

Further, as the blade portion 2, any known type such as a knurled groove, a vertical groove, a spiral groove, etc. can be used.

The bone drilling bur of the present invention is configured as described above, so that the bur can be advanced straightly against the bone surface, and the bar will not be tilted even when grains occur. Furthermore, the depth of the hole being drilled can also be determined using the position of the protrusion.

Therefore, even an unskilled person can accurately and reliably drill a hole of a desired depth and uniform diameter, and it is effectively applied to bone drilling in fields such as dentistry, oral surgery, and orthopedics. It contributes to the success of surgery and has tremendous practical value.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the case of drilling a bone with a conventionally known bone drilling bur, Fig. 2 a, l) is a front view showing the bone drilling bur of the present invention, and Fig. 3 is a bone drilling bur of the present invention. FIG. 3 is an explanatory diagram of a case where a bone is drilled with a burr. 1: Shaft, 2: Blade, 3: Bone, 5: Projection, B: Bone drilling bar

Claims (1)

[Scope of utility model registration request] In a bone drilling bur used in dentistry or surgery, the length of the blade of the bur is shorter than the depth of the hole to be drilled, and at least one part of the shaft of the bur has a diameter of the blade. A bone drilling bur characterized by having a protrusion shaped to have the same or slightly smaller diameter.